As promised, my build -
Shot - 9.0
Dodge - 1.0
Curse Magic - 2.0
Talk - 2.0
Demonology - 2.0
Gun Knowledge - 8.0
Magic Control - 2.0
Chains Acquired -
MB - 6.5
Sharpshooter - 6.0
Some explanation for my expertises being where they are -
First off, this is obviously not a purely damage build. Some expertises above could be seen as "wasted expertise," and they wouldn't be wrong.
I designed this character with clan support in mind, and that is why I possess Class 2 Talk. With this combined with the Lilith SS's skill Whisper of Temptation, I have the highest chance possible (without the corresponding +% to talk gear) to catch demons, making me useful for demon-catching requests.
Shot and Gun Knowledge are where they are so I could possess Sharpshooter 6.0. Sadly, a means to an end, I have no other reasons for having those expertises that high. The 9.0 Shot skill is alright, but not worth the extra expertise. Likewise, 8.0 Gun Knowledge's addition of +1 LNG-R to my total is nice, but unnecessary. I would have preferred to park it at 7.0 just for the reduced shot incantation time, honestly.
Curse is left exactly where it is due to its uselessness in my build. A means merely to unlock MB. Likewise with Demonology, except for Sharpshooter.
Magic Control was leveled to 2.0 for the reduced MP cost for shots. MB already has low CPC (Cost Per Cast), and this knocks down those 2MP shots to 1MP (due to rounding), and so on. It counts for a lot in the long run.
Dodge is leveled merely because I had the leftover Expertise points, and I figured of all the things I could level to class 1, it would be the most useful, stopping rapids dead in their tracks (or bullet frenzies) with a quick Stun Dodge.
Anyway, there we go!